CVE-2026-21883: Bokeh server applications have Incomplete Origin Validation in WebSockets

January 6, 2026 (updated January 8, 2026)

This vulnerability allows for Cross-Site WebSocket Hijacking (CSWSH) of a deployed Bokeh server instance.

References

github.com/advisories/GHSA-793v-589g-574v
github.com/bokeh/bokeh
github.com/bokeh/bokeh/commit/cedd113b0e271b439dce768671685cf5f861812e
github.com/bokeh/bokeh/security/advisories/GHSA-793v-589g-574v
nvd.nist.gov/vuln/detail/CVE-2026-21883

Code Behaviors & Features

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